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The extraction of coal from these deep mines is expensive.
从这些深矿中取得煤是很昂贵的。
youdao
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The value of the gas extraction individually is far lower than the coal value.
瓦斯单独开采的价值远远低于煤炭本身。
youdao
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The value of the gas extraction individually is far lower than the coal value.
瓦斯单独开采的价值远远低于煤炭本身。
youdao